/*
 * Copyright (C) 2021 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.sentry.transport;

import io.sentry.SentryEnvelope;
import io.sentry.cache.IEnvelopeCache;

import java.util.ArrayList;
import java.util.Iterator;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * NoOpEnvelopeCache
 *
 * @since 2021-06-02
 */
public final class NoOpEnvelopeCache implements IEnvelopeCache {
    private static final NoOpEnvelopeCache INSTANCE = new NoOpEnvelopeCache();

    public static NoOpEnvelopeCache getInstance() {
        return INSTANCE;
    }

    @Override
    public void store(@NotNull SentryEnvelope envelope, @Nullable Object hint) {
    }

    @Override
    public void discard(@NotNull SentryEnvelope envelope) {
    }

    @NotNull
    @Override
    public Iterator<SentryEnvelope> iterator() {
        return new ArrayList<SentryEnvelope>(0).iterator();
    }
}
